Air Brakes - An Introduction. How it works.

This video gives an introduction and brief look at air braking systems on heavy and commercial vehicles.
You'll see from the animations that all systems have a compressor to supply the air, reservoirs to store the compressed air, controls for the driver to direct the air (foot and hand brake) and actuators and friction brakes to actually carry out the braking.
This video sticks the the fundamental basics of the Air Braking System and doesn't go as far as other system components such as s-cams, relay, quick release and trailer control valves, air dryers and filters, protection valves and other system operations. We'll go into depth with these in further videos.
For an explanation of the air brake relay, go here: • Air Brake Relay - How ...
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[@ertren6]

As a diesel mechanic for school buses and now going to work for the cities waste managmenet fleet service, vids like these are a breath of fresh air.

[@Sjcstro84]

Thanks good to know. I'm just getting into the industry as well

[@lanceuppercut6168]

Oh wow, that is way more intricate than I thought. Been playing American Truck Simulator and dealing with charging the brake system and loosing pressure has brought me here to try to learn the way it works IRL. Thanks for the vid.

[@kobe7401]

This was just intro and very basic! i am in school for this and this system sucks!

[@deepakk1347]

What do you mean by IRL?

[@beversluis1]

@@deepakk1347 IRL=IN REAL LIFE

[@multiomer1997]

@@kobe7401 Okay, but whats a better system then? Oil braking?

[@kobe7401]

@@multiomer1997 air brakes is really only good for commercial trucks, theres a reason sports cars dont use air brakes lol. I think the concept to learning air brakes sucks i dont think air brakes are bad

[@davidhenderson3400]

Most people do not understand how air brakes work. They think if you lose the air you lose the brakes. When in fact the opposite is true. You lose the air and the brakes lock up. I have lost count at the number of times I have seen movies where the air is lost and they have a run-a-way with no brakes.

[@spongebob6956]

hey fuk you smarty pants... most people don't even know anything about cars they just know that you put oil or electricity in and it moves forward

[@marcoslopez_]

It's like when a jet or plane in a movie loses control and the character is fighting the stick or yoke for dramatic effect. Makes no sense at all. Lol.

[@itsdesean]

We dont either why tf u think we watched the video

[@randabuffer6562]

@@itsdeseanexactly 😂😂

[@randabuffer6562]

Why are you even posting here? Lol

[@vincentscats9314]

now that explains the "tsss" sound I hear everytime a truck brakes. Been curious about it since I was a kid.

[@coffeejazzdude9726]

Thank you very much. I have a test on this tomorrow and this has been an awesome study aid.

[@EducationalMechanics]

Your Welcome Coffeejazzdude, good luck with your test.

[@ryderwilson643]

are u a mechanic now??!

[@Maniac3020]

I am already very familiar with the air braking systems on trains, being a train nut, and while knowing that air brakes on commercial road vehicles must work in a similar manner, I did not know the functional differences. I also did not realize there can be a delay between pressing the brake pedal, and the brakes being applied.

[@edwardgaines6561]

I start CDL training next week. Thanks for rundown, I hope this all sinks in!

[@MrKennedyfoodman]

Did you pass the general knowledge,combination and air brake let talk on iG november_kennedy pls Bcus I’m trying to do the test

[@romanosingh5213]

How’d it go did u pass

[@bunnyman6321]

@@MrKennedyfoodman You do the test?

[@MrKennedyfoodman]

@@bunnyman6321 yes and I passed am now a CDL driver working $36 an hour

[@bunnyman6321]

@@MrKennedyfoodman Congratulations! May you have much success !

[@soundwavez3554]

Keeping it simple ~ well done.

[@EducationalMechanics]

Thanks sound wavez. 😀

[@nick-cj3dw]

Thank you so much for this great great video!

[@ninestories2]

Thank you for the captions! 🖤

[@GunawanWidihardjo]

Thank you, this video is very helpful for air brake system analysis

[@balakumaran6056]

Actuators is used for braking speed of rear brake than the front brake when brake is applied , so the heavy vehicle is control the balance by driver

[@lukashlr]

This is a power of an air brakes 😊

[@Michelle_Schu-blacka]

From what I can gather, air brakes work in a sort of opposite way to hydraulic brakes. In hydraulic brakes, you need fluid to compress the pads against the discs, but in lorries, you're sort of taking air away, allowing the brakes to 'unlock' and compress against the rotor, so if you have no air, the brakes stay 'unlocked'. Does that sound about right?

[@syedarizvi5681]

Good explanation 🙌🏻

[@vasiliymedvedev1532]

So when you engage, the handbrake air is pumped into a chamber in the brakes, releasing them. When the brake pedal is pressed is the air released from the handbrake chamber? or more air is pumped into an opposite to the handbrake air chamber (working against the handbrake) and engages the brake and then when foot pedal is released the air from this second air chamber is released make the brakes free?

[@PopCapMusicTrending]

I am just curious why those big vehicles make that air-compressed sound when moving from a complete halt.

[@dsrabelo]

Educational Mechanics, could you please enable adding subtitles to your video? I would like to add a Portuguese version of the subtitle for this great video! Thanks!

[@EducationalMechanics]

Hi Diogo, I've turned on community contributions, thank you very much for your help. 🙂

[@ErniLandia]

thanks for your work lad

[@paragjh284]

What is the time lag between application of break and stopping of unloaded truck 16 tyres running 50 km/h?

[@jaydennichols4806]

1 1/2 second

[@dhxl]

Hmm...Still don't get how the amount of brake torque is regulated? The more you press the brake pedal the more you get air input to the brake chamber. But? But! Let's say we have infinite amount of time and the brake pedal is 1% pressed. Versus. The same conditions but brake pedal is 100% pressed. So will we have the same brake torque at some point with the difference that 100% pressed brake pedal will generate that max brake torque much faster, while 1% pressed pedal will take considerable time to generate that max brake torque?

[@EducationalMechanics]

Hi Igor. I'll try and help. The driver's brake pedal is a proportional valve, so if the pedal is pressed down 1% it will only deliver 1% of the total pressure. The pressure will not climb. With the brake pedal (the foot control valve) pressed down 1%, the foot control valve would hold at 1% and the air would make it's way to the brake chambers to apply 1% brake torque/force. If the driver pressed the brake pedal at 50%, this would apply the brake force at 50% and so on. It's why the majority of valves have a "HOLD" position, to maintain a pressure/force. I hope that helps and welcome anyone else who can explain it a bit better. Thanks.

[@dhxl]

@@EducationalMechanics Yes, It helped, thanks)

[@19mchlrdx]

I have been driving trucks for 15 years(this upcoming april) and I know absolutely everything about the air brake system....but one thing I've never understood is where the hell does the air exaust from the brake chamber?? The high pitch air expell.....is it from the gap in the slack adjuster??? I'm no rookie but I'm just curious lol

[@nurazimnurazim1916]

Баракелде 👍👍 молодец 👍👍

[@markquiswest6607]

Trains got these type of breaks too!

[@zydbadoy4362]

Thank you

[@EducationalMechanics]

You're welcome Zyd, thanks for watching.

[@charlie.saturday]

Thank you!!

[@Basiversity]

Moral of the story, they do the exact opposite on what regular vehicles do

[@jasonsahl4529]

Not sure where you got all your footage from, but the opening B-roll is definitely from Olathe, KS.

[@TheDavidMetcalfe]

Decent video on the functionality, but it does nothing to explain how this system is better for larger vehicles.

[@willdatsun]

heck of a delay, that truck would have no chance if it was really that slow to work

[@nightmareinaction629]

Is that why I see a lot of semi tire Mark's do they run out of air and brakes engage or what ?

[@conortobin6180]

It could happen. But more than likely the drivers are locking up their wheels with a light load.

[@DJSTOEK]

Thanks

[@manojrabvad7630]

Mera gadi bs6 2820hai to break marne par lainer pakadtahi to kya karna hoga

[@lexusry]

WHAT PRESSURE DOES AIR BRAKE SYSTEM RUN AT ?? 60 PSI. 100 PSI. 125 PSI ????

[@maxthereof]

NO ONE KNOWS !!!

[@timno9804]

Depends on the system

[@brandonkrebbs]

120

[@GuerillaManifesto]

So for the parking brake, you're essentially forcing air into the chamber to compress the discs? And the same for standard braking, you're forcing air to compress the discs? And when you let off the pedal (or release the parking brake) you're letting the air out of the chamber?

[@kristupasantanavicius9093]

Yes, but its the reverse. The actual braking is done with a powerful mechanical spring. When there is no air in the system, the spring is engaged and pushing hard on the brakes. When the truck is started, air pressure pushes back against the brake spring, releasing the brakes. When you push on the pedal, air pressure is relieved from the spring, and in turn the spring pushes on the brakes again. This means that if for some air pressure drops, the truck will automatically stop until air pressure is built up again.

[@C.H771]

Where is the governor?

[@browser37]

Same I was asking.

[@EducationalMechanics]

The governor is usually either part of the compressor or the air filter, or both. Right at the beginning. I’ve left it out of this video just to keep things simple. Hope that helps.

[@mcgleas]

Are those Brembos @ 1:50? , lol.

[@rgmoore]

Air isn't more powerful than hydraulic. The reason air is used is due to other reasons.

[@echln3209]

I thought that sound was a blow off sound all this time 😂

[@stealhty1]

So the air is to release the brakes from the power spring ?

[@mrblack61]

as i understand. the parking brake is powered by large springs, when the parking brake is released, air pressure overcomes the springs and releases the parking brake. Im brand new on the subject but heres a simple overview of how things go. kzbin.info/www/bejne/e525qoyBfMqIZ8k

[@hg2.]

Isn't this confusing? In other words, if there's NO air pressure, the brakes are always ON?

[@hg2.]

Here's a good explanation of "spring brakes", at about min 4:00 kzbin.info/www/bejne/aZ7VhoCKhZmnnqs

[@davidhenderson3400]

@@hg2. YES, all the TV movies where you seen a truck lose air and brakes had it wrong. Air it used to hold the brakes OFF. I always find it funny when I seen this mistake in a movie.

[@patriciafigueroa5902]

I’m confused

[@stefanpigford6891]

go away

[@edwardgaines6561]

@@stefanpigford6891 Damn, she's trying to learn!

[@hanisitsobarna4897]

just take run, how gonna be to traffic about air brakes system..... 🤞 😅

[@mrhtiwari]

प्रफुल्ल सुटिग हिन्दी में देने की कोशिश करें

[@irfansaiyed2459]

Bismillah Allhamdolillah Mashaallah SubhanAllah Assalam alaykum ya rasul Allah ya habibi ya nabi Allah Allah hu Akbar

[@kirtanjass8032]

Its not that easy as i was thinking it bit of the subject

[@Venom-nk8nd]

🇵🇬🇵🇬, ,

[@wojciechzgodowski]

I have a much better idea for truck breaks, safer and more reliable. But I won't share it, as sharing ideas on the internet doesn't bring any $. Let the engeneers , ones that get paid too$ to design new systems do their jobs. They have great large houses all their lifes everything needed. I have a good idea but 🖕🥲